genirq: Remove default magic

Now that everything uses the wrappers, we can remove the default
functions. None of those functions is performance critical.

That makes the IRQ_MASKED flag tracking fully consistent.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --cc kernel/irq/chip.c
Simple merge

diff --cc kernel/irq/manage.c
Simple merge